This is the type of snail I have: http://www.liveaquaria.com/product/prod_display.cfm?pcatid=1091&N=4
Notice that in the description it says that it is a type of apple snail.
And I noticed that it says they eat plants but I've never seen mine eat my plants so I'm not sure about that. Maybe mine is too well fed on other things like algae and leftover fish food.

Common names are too vague to be of much use sometimes. This is a classic example. There are a number of different species of snail referred to as 'apple snails', the two most common being p. bridgesii and p. canaliculata (both have profiles in the gallery). If you have a planted tank, bridgesii is the kind you want. They don't eat plants and stay smaller than their close cousin, plus they come in quite a few more colour types. Here's a picture of one of my magenta p. bridgesii snails:
For more ID tips, visit www.applesnail.net .They have a whole section of the site devoted to telling the different species apart, but they also include care and breeding tips._________________Am I obsessed? Wait a minute... don't answer that!